I think it's whatever works best for the person really...

I've been resting all day today, because I went back to work for all of 4 days last week and yesterday, I'm knackered, this is the first time I've really been up today. And I went to be at 7pm yesterday.
I hate feeling so helpless, and certainly mentally felt better while I was working and being 'me'.
I just need to learn how to pace myself properly (2 and half weeks off, back to work for nearly two full weeks hasn't worked - I stupidly thought I could just go back when I felt almost normal again..)

I suppose it's whatever makes that person feel better... I do think rest is the key but balanced with mental stimulation..